Give the classification of mass transfer operation and explain with example.
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Answer:
Explanation:
Mass transfer operations
The operation carried out for separating the component of the mixture, involving the transfer of (mass) material from one homogeneous phase to another, due to the difference in vapor pressure, solubility or diffusivity and in which driving force for transfer is a concentration the difference is called mass transfer operations
Example:- Distillation, Gas absorption, Liquid Extraction, Drying
Example of mass transfer operations
Depending upon phase contact between Gas, liquid and solid phase following are the classification of the mass transfer operations
Gas-gas phase contact
The fragrance of incense sticks after lightning diffuse from one room to another room.
Gas-liquid contact
A cup of water left in a room eventually evaporate as a result water molecules diffusing into the air. This is liquid to gas diffusion.
Gas absorption:- If a mixture of ammonia and air is contacted with liquid water, a large portion of ammonia will dissolve in the liquid, and in this way air ammonia mixture can be separated.
Desorption or stripping:- If air is brought into contact with an ammonia-water solution, some of the ammonia leaves the liquid and enters the gas phase.
If the liquid phase is a pure liquid, containing one component while the gas contains two or more, the operation is humidification or dehumidification depending upon the direction of transfer
Humidification of the air: - When dry air contacted with liquid water result in evaporation of some water into the air
Dehumidification: - When very moist air contacted with pure liquid water may result in condensation of part of moist air in the air.
Answer:
Explanation:
દબાણ અને તાપમાન બંને ગેસના પ્રસાર પર અસર કરે છે. સામાન્ય રીતે, દબાણ અને તાપમાન સાથે ગેસની વિવિધતા વધે છે. અભેદ્યતા પરિણામો દર્શાવે છે કે તે સૌથી ઓછી અભેદ્યતા ધરાવતો કોલસો અને ઉચ્ચતમ ક્રમના કોલસાના સંદર્ભમાં ઘણો બદલાય છે.